Amplifiers – With semiconductor amplifying device – Including particular biasing arrangement
Reexamination Certificate
2005-03-22
2005-03-22
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including particular biasing arrangement
C330S085000
Reexamination Certificate
active
06870427
ABSTRACT:
The operation of a bipolar transistor is controlled comprising by producing a first voltage that is a product of a static collector current of the bipolar transistor times an emitter resistance. The first voltage is then compared to a predetermined reference voltage to produce a control signal. Current is then injected a base of the bipolar transistor in response to the control signal. In a specific implementation, the first voltage, which is a product of the static collector current (Ic) of the bipolar transistor times its emitter resistance (RE) , is slaved to a predetermined reference voltage (Vref) whose value is substantially equal, to within a tolerance, to 13 mV at a temperature at or about 27° C.
REFERENCES:
patent: 4591743 (1986-05-01), Kung
patent: 5760651 (1998-06-01), Wong
patent: 6271721 (2001-08-01), Trask
patent: 6509722 (2003-01-01), Lopata
patent: 6617928 (2003-09-01), Finlay et al.
patent: WO 9805118 (1998-02-01), None
French Search Report, FA 617420/FR 0203806, dated Dec. 19, 2002.
Cathelin Philippe
Grasset Jean-Charles
Choe Henry
Jenkens & Gilchrist P.C.
STMicroelectronics S.A.
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